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Phenolic foam prepared by using incombustible foaming agent and preparation method for phenolic foam

A technology of phenolic foam and phenolic resin, which is applied in the field of phenolic foam and its preparation, can solve harsh and other problems, and achieve the effect of improving the safety of use and reducing the risk of corrosion

Active Publication Date: 2014-01-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the preparation methods of the above-mentioned phenolic foams all need relatively harsh conditions, so there is room for improvement.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0046] The preparation method of the polyacrylate emulsion is not particularly limited, and a common polyacrylate emulsion polymerization method, such as anion-initiated polymerization, can be used.

[0047] As an aqueous suspension of calcium carbonate, it can be obtained by dispersing calcium carbonate in water under the action of ultrasonic dispersion.

[0048] In a preferred embodiment, polyacrylate emulsion modified calcium carbonate is prepared by the following method:

[0049] (1) Backup acrylate monomer, initiator, emulsifier, pH buffer and deionized water according to the following mass percentages: acrylate monomer: 20-40%; initiator: 0.3-1%; emulsifier: 1~2%; buffer: 0.5~1%; the balance is deionized water;

[0050] (2) The initiator is dissolved in deionized water in step ① to make solution B;

[0051] (3) Take 5-10wt.% of the acrylate monomer in step ①, the emulsifier, pH buffer and the remaining deionized water in step ①, mix them into the reactor, stir and vent...

Embodiment 1

[0077] 1) Preparation of polyacrylate emulsion modified calcium carbonate

[0078] ① Mix 10g ethyl acrylate (EA), 0.435g ammonium persulfate (APS), 1.739g sodium dodecyl sulfate (SDS), 0.87gpH buffer NaHCO 3 Mix with 180g of deionized water and add to the reactor, stir and ventilate nitrogen to exhaust oxygen, pre-emulsify at room temperature for 40min;

[0079] ②Heat the obtained emulsion to 70°C, add ammonium persulfate (APS) aqueous solution (containing 0.2g of APS, 15g of water), and after the blue light appears in the system, add 73.5g of ethyl acrylate and 3.5g of glycidyl acrylate dropwise at the same time The mixed monomer and APS aqueous solution are added dropwise within 1.5 hours, and the acrylate mixed monomer is added dropwise first;

[0080] ③ After the dropwise addition, continue to react at 70° C. for 6 h under nitrogen protection and stirring, and finally cool to obtain a polyacrylate emulsion with a solid content of 30% wt.%.

[0081] ④ Stir and mix the pol...

Embodiment 2

[0087] 1) Preparation of Rosin Modified Calcium Carbonate

[0088] Put 17.5g of rosin, 17.5g of calcium carbonate and 0.17g of PEG-1000 into a beaker, heat it with an electric heating mantle until it melts, stir it well, pour it out and cool it, after cooling, crush it with a high-speed pulverizer, and use a 0.25mm mesh screen Filter to finally get the desired rosin-modified calcium carbonate.

[0089] 2) Synthesis of foamable phenolic resin

[0090] Add 600g of phenol, 345g of solid formaldehyde and 375g of demineralized water into a 2L four-necked flask, turn on the stirring and cooling tube, keep the temperature at 30°C to 40°C, add 4.2g of magnesium oxide, slowly raise the temperature to 80°C to 90°C, and react at constant temperature 3h, vacuum dehydration, the vacuum degree is -0.08~-0.1MPa, when the viscosity of the system reaches 4000mPa·S, cool and discharge;

[0091] 3) Preparation of phenolic foam

[0092] Add 100g of foamable phenolic resin, 3gL5400, 15g of rosi...

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Abstract

The invention discloses phenolic foam. The phenolic foam is prepared from foamable phenolic resin, surfactant, modified calcium carbonate, filler and curing agent, wherein the modified calcium carbonate is selected from polyacrylate emulsion modified calcium carbonate, rosin modified calcium carbonate, solid paraffin modified calcium carbonate and thermoplastic phenolic resin modified calcium carbonate; and the phenolic foam does not have a smoldering property and has the pH value of 5 to 6.

Description

technical field [0001] The invention relates to a polymer foaming material, in particular to a phenolic foam and a preparation method thereof. Background technique [0002] Phenolic foam material is a new type of building material with excellent fire prevention, heat insulation, sound insulation, light weight and energy saving performance. The thermal conductivity of phenolic foam material is low, and its flame retardancy is significantly better than that of polystyrene foam and polyurethane foam currently used in the construction industry. Carbonization is a thermal insulation material with excellent fire performance, which is expected to replace traditional organic polymer thermal insulation materials such as polyurethane foam and polystyrene foam. [0003] At present, for building materials, energy saving and emission reduction are required, especially for external insulation materials for building exterior walls, which not only require excellent thermal insulation effec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L61/06C08J9/08C08K13/02C08K3/34C08K3/26C08K13/04C08K7/14C08K3/22
Inventor 陈晓农郑小生赵耀耀石淑先李晶苏志强
Owner BEIJING UNIV OF CHEM TECH
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